Subset-023 Glossary Of Terms And Abbreviation

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ERA * UNISIG * EEIG ERTMS USERS GROUPERTMS/ETCSGlossary of Terms and AbbreviationsREF :ISSUE :DATE :SUBSET-0233.3.0SUBSET-0233.3.013/05/2016Glossary of Terms and AbbreviationsPage 1/29

ERA * UNISIG * EEIG ERTMS USERS GROUP1.MODIFICATION HISTORYIssue NumberDateSection number0.0.1AllModification / DescriptionFirst issue.AuthorSven AdomeitHans KastJean-Christophe Laffineur0.0.2AllReuse of EEIG glossarySven AdomeitHans KastJean-Christophe Laffineur0.0.3AllReview of SRS;Sven AdomeitNew SRS Chapter0.0.4.AllUpdating referencesSven AdomeitAdd: RAP:RMP:MAR:Mode Profile0.0.5.AllFeb 20000.1.0.WLHVersion 2AllUpdating following UNISIG review WLHand comments from Adt ,Alst.AllFurther comments from AlstomWLHFinal issue to ECSAGU.D. (ed)Revised edition for baseline 3B. StammMarch 20000.2.0.Updating for Class 1 SRSMarch 20002.0.030 March 20002.9.1All08 February20122.9.201 March 2012S. AdomeitA. HougardyAllAs per UNISIG review commentsA. HougardyAdd new entries ACK, KER andLUCRefine definition of Train InterfaceSUBSET-0233.3.0Glossary of Terms and AbbreviationsPage 2/29

ERA * UNISIG * EEIG ERTMS USERS GROUPUnit3.0.0Baseline 3 release versionA. HougardyCR 1124O. Gemine02 March 20123.0.104 April 20143.0.223 April 2014Baseline 3 1st maintenance pre- O. Geminerelease version3.0.3CR 122306 May 2014Baseline 3 1st maintenance 2nd prerelease version3.1.0Baseline 3 1st maintenance release O. Gemineversion12 May 20143.1.1O. GemineCR’s 852, 1260O. GemineCR’s 299, 539, 1084, 1163, 1237O. Gemine23 June 20153.1.217 November20153.1.316 December20153.2.018 December20153.2.128 April 20163.3.0CR1283 plus update due to overall O. GemineCR consolation phaseBaseline 3 2nd release version as O. Geminerecommended to EC (see ERAREC-123-2015/REC)CR 1249 reopening following RISC O. Gemine#75Baseline 3 2nd release versionA. Hougardy13 May 2016SUBSET-0233.3.0Glossary of Terms and AbbreviationsPage 3/29

ERA * UNISIG * EEIG ERTMS USERS GROUP2.TABLE OF CONTENTS1. MODIFICATION HISTORY. 22. TABLE OF CONTENTS. 43. GENERAL . 53.1.Scope of this document . 53.2.Introduction . 54. TERMS. 65. ABBREVIATIONS . 26SUBSET-0233.3.0Glossary of Terms and AbbreviationsPage 4/29

ERA * UNISIG * EEIG ERTMS USERS GROUP3.GENERAL3.1.Scope of this documentThis document defines the significant Terms and Abbreviations used in the ERTMS/ETCSspecifications.3.2.IntroductionMany of the terms and abbreviations used within the ERTMS/ETCS specifications have beendefined elsewhere but they are repeated herein when they have a relevance to the ERTMS/ETCSsystem. The hierarchy of documents / glossaries consulted was as follows:European Interoperability Directive 2008/57/EC1Control Command Signalling Technical Specification for Interoperability (CCS TSI)2CENELEC EN50126 – September 19993CENELEC EN50129 - December 19994Note: 1. Only the highest level terms are repeated from references 3 and 4.2. Any term not given a numbered reference is by definition an ETCS defined term.3. Some terms from the references have been redefined to match the ETCS context.These are now ETCS defined terms4. Low level ETCS documents such as those relating to Key Management contain their owndefinitions.SUBSET-0233.3.0Glossary of Terms and AbbreviationsPage 5/29

ERA * UNISIG * EEIG ERTMS USERS GROUP4.TERMSACKNOWLEDGEMENTConfirmation by an entity that it has received informationACKNOWLEDGEMENT, Confirmation by the driver that he/she has taken into accountDRIVERinformation received through the DMIAIRGAPThe set of interfaces between track and train. It is composed ofthe Eurobalise, the Euroloop and the Euroradio interfaces.AIRGAP LANGUAGEThe ERTMS/ETCS application data, together with itsharmonised rules, which is transmitted over the balise, loop andradio transmission media.APPLICATION LEVELThe different ERTMS/ETCS application levels are a way toexpress the possible operating relationships between track andtrain. Level definitions are related to the trackside equipmentused, to the way the trackside information reaches the on-boardunits and to which functions are processed in the trackside andin the on-board equipment respectively.AUTHENTICATIONThe process of determining whether someone or something iswho or what it is declared to be.AUTHENTICATION KEY Cryptographic key (KMAC) used to establish a safe connectionaccording to the EURORADIO protocol.AUTOMATIC TRAINPROTECTIONA safety system that enforces either compliance with orobservation of speed restrictions and signal aspects by trains.AVAILABILITYThe ability of a product to be in a state to perform a requiredfunction under given conditions at a given instant in time or overa given time interval assuming that the required externalresources are provided. (3)Definitions for other availability related terms are given inreference 3BALISEA passive transponder mounted on the track which cancommunicate with a train passing over it.BALISE,FIXEDA balise that transmits data that does not change dynamicallyaccording to signalling information.BALISE,SWITCHABLEA balise that transmits data that can change dynamicallyaccording to signalling information.BALISE GROUPOne or more balises which are treated as having the samereference location on the track. The telegrams transmitted by allthe balises of a group form a track-to-train message.BALISE GROUP COORDINATE SYSTEMThe means to ensure common location referencing between onboard and trackside, for all location based informationexchanged through the ERTMS/ETCS transmission media.SUBSET-0233.3.0Glossary of Terms and AbbreviationsPage 6/29

ERA * UNISIG * EEIG ERTMS USERS GROUPBALISE GROUPLOCATIONREFERENCELocation of balise number 1 in a balise group. It is the origin ofthe balise group coordinate systemBALISETRANSMISSIONMODULEA module inside the ERTMS/ETCS on-board equipment forintermittent transmission between track and train, whichprocesses Up-link signals and retrieves application datatelegrams from a balise.BASELINEA baseline is defined by a stable kernel in terms of systemfunctionality, performance and other non-functionalcharacteristics.BASELINE RELEASEA baseline release is defined by a specific version of each ofthe CCS TSI annex A documents that are relevant for thesystemBLOCKA method of controlling the separation between trains by dividingthe line into sections with, normally, no more than one train ineach section. The block can either be a fixed block or a movingblock.BRAKING CURVEPrediction of the train speed decrease versus distance by theERTMS/ETCS on-board equipment, from a mathematical modelof the train braking dynamics and of the track characteristicsahead.BRAKING DISTANCE,EMERGENCYThe distance in which a train is capable of stopping with theemergency brake applied. Dependent upon train speed, traintype, braking characteristics, train weight and gradient.BRAKING DISTANCE,SERVICEThe distance in which a train is capable of stopping, with the fullservice brake applied. Dependent upon train speed, train type,braking characteristics, train weight and gradient.CABThe space in the power unit or driving unit of the train containingthe operating controls and providing shelter and seats for thedriver or engine crew.CAB, ACTIVEThe active cab is the cab associated with an ERTMS/ETCS onboard equipment, from which the traction is controlledCLEAR (A SIGNAL)To change a signal aspect from its most restrictive aspect to aless restrictive aspect.COMMON-MODEFAULTFault common to items which are intended to be independent.CONDITIONAL LEVELTRANSITION ORDERA Conditional Level Transition Order is a spot check of the onboard operated level. This may cause a level transition if theERTMS/ETCS on-board does not operate one of the allowedlevels.CONDITIONS,MAINTENANCEThe maintenance criteria adopted for maintaining the systemreferred to its Operating Conditions.SUBSET-0233.3.0Glossary of Terms and AbbreviationsPage 7/29

ERA * UNISIG * EEIG ERTMS USERS GROUPCONDITIONS,OPERATINGThe rated performance required of the system.CONDITIONS, SYSTEMThe conditions under which the system is called to operate,including: environmental conditions; operating conditions; maintenance conditions.CONFIGURATIONThe structuring and interconnecting of the hardware andsoftware of a system for its intended application.CONFIGURATIONMANAGEMENTA discipline applying technical and administrative direction andsurveillance to identify and document the functional andphysical characteristics of a configuration item, control changeto those characteristics, record and report change processingand implementation status and verify compliance with specifiedrequirements. (3)CONFLICTINGMOVEMENTSMovements that would require trains to occupy the same portionof track over all or part of their length.CONTACT LENGTHThe distance between the place where a train becomes able tocommunicate with a device (e.g. a balise) to the place wherecommunication becomes impossible.CONTINOUS DATATRANSMISSIONTrack-to-train or train-to-track transmission that can take placecontinuously, independent of location (e.g. by radio).CONTROL CENTREA centralised control system that controls the train movementsin a large territory.CRITICALITYThe point at which a failure or a number of failures renders thesystem unusable and/or unsafe.CROSS-ACCEPTANCEThe status achieved by a product that has been accepted byone Authority to the relevant European Standards and isacceptable to other Authorities without the necessity for furtherassessment. (4)CURRENT POSITIONThe position of a train measured at a certain moment usingdefined system co-ordinates.DANGER (ASPECT)An indication given by a signal to stop.DANGER POINTThe location beyond the End of Movement Authority that can bereached by the front of the train without creating a hazardoussituation.DATA INTEGRITYThe property that a message has not been modified ordestroyed.DECELERATION DATAData that relates to the braking performance of the train.DEFAULT VALUEValue stored in the ERTMS/ETCS on-board equipment andused if there is no other value available.SUBSET-0233.3.0Glossary of Terms and AbbreviationsPage 8/29

ERA * UNISIG * EEIG ERTMS USERS GROUPDESKInside a cab, the set of operating controls, which is dedicated topreferred movements in a given direction (i.e. forwardmovements, in which visibility from the cab is provided to thedriver).Exception: some single cab locomotives are fitted with onesingle desk, allowing normal movements in both directions.DIVERSITYA means of achieving all or part of the specified requirements inmore than one independent and dissimilar manner. (4)DRIVER IDENTITYUnique code which identifies a train driver.DRIVER MACHINEINTERFACEThe interface to enable direct communication between theERTMS/ETCS on-board equipment and the driver.DRIVING ON SIGHTThe driver driving at a speed that allows him to stop the train toavoid obstacles on the track.DUAL CAB ENGINERolling Stock unit fitted with two driving cabs and one singleERTMS/ETCS on-board equipment.DYNAMIC SPEEDPROFILEThe speed / distance profile that a train may follow withoutviolating the static speed profile and/or the EOA/LOA.EMERGENCYBRAKINGApplication of a predefined brake force in the shortest time inorder to stop the train with a defined level of brake performance.END OF LOOPMARKERThe balise group intended to define where a “loop” begins orends.END OF AUTHORITYLocation to which the train is permitted to proceed and wheretarget speed zero.END OF MOVEMENTAUTHORITYLocation to which the train is permitted to proceed according toan MA. When transmitting an MA, it is the end of the last sectiongiven in the MA.ENGINEAssociation of one or two driving cab(s) of a Rolling Stock unitwith one single ERTMS/ETCS on-board equipment.When a driving cab of the engine is used to lead a train/shuntingconsist, the ERTMS/ETCS on-board equipment supervises themovement of the train/shunting consist the engine belongs to.Each driving cab of an engine allows the driver communicatingwith the ERTMS/ETCS on-board equipment through the DMI.ENTRANCE SIGNALA main signal, intended for trains entering a station.EQUIPPED LINELine equipped with ERTMS/ ETCS in application level 1, 2 or 3ERTMS/ETCSON-BOARDEQUIPMENTThe part (software and/or hardware) of the on-board equipment,which fulfils the ERTMS/ETCS specification.ESTIMATED SPEEDThe speed the odometer estimates the train is running at, withthe highest probability according to the physical characteristicsof the train and to the odometer working conditionsSUBSET-0233.3.0Glossary of Terms and AbbreviationsPage 9/29

ERA * UNISIG * EEIG ERTMS USERS GROUPESTIMATED POSITIONThe position the ERTMS/ETCS on-board equipment estimatesthe train front is at, with the highest probability according to thephysical characteristics of the train and to the odometer workingconditions. It is expressed as a distance from a locationreference detected by the on-board.ETCS IDENTITYThe ETCS identity of an on-board equipment is made of asingle identity number. The ETCS identity of an RBC, balisegroup, loop or RIU is composed of a country/region identitynumber and of an identity number within the country/region.EUROPEAN RAILTRAFFICMANAGEMENTSYSTEMSignalling and operation management system encompassingETCS for the Control Command and GSM-R for voice and datacommunication. GSM-R is used as radio bearer for ETCS.EUROPEAN TRAINCONTROL SYSTEMThe Control Command part of ERTMS.EUROBALISEBalise compliant with the ERTMS/ETCS specification.EUROLOOPLoop compliant with the ERTMS/ETCS specification.EURORADIOThe functions required, including the message protocols, toprovide an acceptably safe communications channel betweenERTMS/ETCS trackside and ERTMS/ETCS on-boardequipment over an open radio networkEXIT SIGNALA main signal that is intended for trains leaving a station.EXPECTATIONWINDOWThe interval between the outer limits to accept a balise group.FAIL-SAFEA design philosophy which results in any expected failuremaintaining or placing the equipment in a safe state.FAILUREEffect of an error on the intended service.FAULTAn abnormal condition that could lead to an error in a system. Afault can be random or systematic. (4)FAULT DETECTIONTIMETime span that begins at the instant when a fault occurs andends when the existence of the fault is detected.FAULT NEGATIONTIMETime span that begins when the existence of a fault is detectedand ends when a safe state is enforced.FIXED BLOCKA block in which the extremities of the block sections are at fixedlocations. The signalling allows a train to move from one block tothe next, normally only when the block ahead is clear.FOULING POINTThe place where a vehicle standing on a converging line wouldcome into contact with a vehicle on the other line.FULL SUPERVISIONMODEERTMS/ETCS on-board equipment mode giving full protectionagainst overspeed and overrun.HOME KMCThe KMC in a KM domain to which trackside and on-boardentities belonging to that domain refer for key management.SUBSET-0233.3.0Glossary of Terms and AbbreviationsPage 10/29

ERA * UNISIG * EEIG ERTMS USERS GROUPIMMEDIATE LEVELTRANSITION ORDERAn Immediate Level Transition Order means both a leveltransition ordered “now” and a level transition ordered at nulldistance not in relation with in-fill.IN ADVANCE OFA term indicating a point beyond a specific location on the track,with respect to a given direction.IN REAR OFA term indicating a point on the approach to a specific locationon the track, with respect to a given rear ofin advance ofSpecificlocationINDEPENDENCE,TECHNICALFreedom from any mechanism which can affect the correctoperation of more than one item.INFILL INFORMATIONTrackside data, referred to a main signal, which is transmitted atlocations in rear of the main signal. Provides, for example, theability to inform a train that the signal ahead has cleared.INFILL LOOPA loop which is installed at a place (e.g. in rear of a signal) toavoid unnecessary delay by transmitting in fill informationadvising the train at once when the signal ahead clears.INFORMATION POINTSpecific location on the track where information can betransmitted from ERTMS/ETCS trackside to ERTMS/ETCS onboard equipment (see also SPOT TRANSMISSION)INTERLOCKINGA general term applied to the controlling of the setting andreleasing of “signals” and “points” to prevent unsafe conditionsarising, and equipment which performs this function.INTERMITTENTTRANSMISSIONA term that encompasses “SPOT TRANSMISSION” and “SEMICONTINUOUS TRANSMISSION”.INTEROPERABILITYInteroperability means the ability to allow the safe anduninterrupted movement of trains that accomplish the specifiedlevels of performance. (1)INTEROPERABILITYCONSTITUENTAny elementary component, group of components,subassembly or complete assembly of equipment incorporatedor intended to be incorporated into a subsystem, upon whichthe interoperability of the rail system depends either directly orindirectly. The concept of a constituent covers both tangibleobjects and intangible objects such as software. (1)SUBSET-0233.3.0Glossary of Terms and AbbreviationsPage 11/29

ERA * UNISIG * EEIG ERTMS USERS GROUPINTEROPERABILITY,OPERATIONALThe set of harmonised operating rules that The set of harmonised technical requirements that enablesinteroperability. The ERTMS/ETCS specification defines therequirements for technical interoperability.INTERVENTIONWhere ERTMS/ETCS takes control from the driver by cuttingtraction power or applying the full service brake and cuttingtraction power or applying the emergency brake and cuttingtraction power.ISOLATION MODEWhen the ERTMS/ETCS on-board equipment is disconnectedfrom the vehicle braking system. Isolation is indicated to thedriver.JURIDICAL DATAData to record all actions and exchanges relating to themovement of trains sufficient for off line analysis of all eventsleading to an incident.KERNELThe core of the ERTMS/ETCS on-board equipment.KEYA predefined component or information necessary to be able toencrypt data or interpret encrypted data.KEY MANAGEMENTThe generation, storage, secure distribution, deletion, archivingand application of key entries in accordance with the securitypolicy in a KM domain.KEY MANAGEMENTCENTREThe entity responsible for key management functions in a KMdomain.KEY MANAGEMENTSYSTEMThe set of entities and operational procedures taking part in thekey distribution system.KEY VALIDITY PERIODThe specific timespan during which a key is valid.KM DOMAINOne KMC (Home KMC) and all the on-boards, RBCs and RIUsusing that KMC for key management purposes.LAST RELEVANTBALISE GROUPThe LRBG is used as a common location reference betweenthe ERTMS/ETCS on-board and trackside equipments in levels2&3LEADING ENGINEThe engine in which a driving cab is used to control themovement of a train/shunting consist, under the supervision ofthe ERTMS/ETCS on-board equipment associated with thedriving cab.LEVELContracted form of APPLICATION LEVELSUBSET-0233.3.0Glossary of Terms and AbbreviationsPage 12/29

ERA * UNISIG * EEIG ERTMS USERS GROUPLEVEL 0A level of ERTMS/ETCS defined to cover instances when theERTMS/ETCS on-board equipment is operating in an areawhere the trackside is neither fitted with operationalERTMS/ETCS equipment nor fitted with operational NationalSystemLEVEL 0 AREATrackside area in which level 0 operation is supported.LEVEL 1A level of ERTMS/ETCS overlaid onto conventional line sidesignalling that uses Eurobalises / Euroloop / Radio Infill to passmovement authorities to the train whilst relying on conventionalmeans to determine train position and integrity.LEVEL 1 AREATrackside area in which level 1 operation is supported.LEVEL 2A level of ERTMS/ETCS that uses radio to pass movementauthorities to the train whilst relying on trackside conventionalmeans to determine train position and integrity.LEVEL 2 AREATrackside area in which level 2 operation is supported.LEVEL 2/3 AREATrackside area in which level 2 and/or level 3 operation issupported.LEVEL 3A level of ERTMS/ETCS that uses radio to pass movementauthorities to the train. Level 3 uses train reported position andintegrity to determine if it is safe to issue the movementauthority.LEVEL 3 AREATrackside area in which level 3 operation is supported.LEVEL NTCA level of ERTMS/ETCS that allows the supervision of the trainwith an existing National Train Control system.LEVEL NTC AREATrackside area in which level NTC operation is supported.LEVEL TRANSITIONANNOUNCEMENTA Level Transition Announcement means both a level transitionordered for a further location and a level transition ordered atnull distance transmitted as in-fill informationLEVEL TRANSITIONBORDERA location where the list of levels supported by the tracksidechanges.LEVEL TRANSITIONINFORMATIONThis term is used for both Level Transition Order andConditional Level Transition Order.LEVEL TRANSITIONORDERThis term is used for both Immediate Level Transition Order andLevel Transition Announcement.LIFECYCLE COST(SYSTEM)The sum of the costs sustained or to be sustained forperforming and appropriately supporting the activities occurringin the context of the operational parts of the System Lifecycle.LIFECYCLE (SYSTEM)The activities occurring during a period of time that starts whena system is conceived and ends at decommissioning when thesystem is no longer available for use. (See Reference 3)SUBSET-0233.3.0Glossary of Terms and AbbreviationsPage 13/29

ERA * UNISIG * EEIG ERTMS USERS GROUPLIMITED SUPERVISION ERTMS/ETCS on-board equipment mode giving partialMODEprotection against over speed and over run. The driver has toobserve and obey to line side signals and operating rules whenin limited supervision mode.LIMIT OF AUTHORITYThe place beyond which the train has no information but towhich the train is authorised to run with a defined target speedhigher than zero. The train is expected to receive newinformation before passing the Limit of Authority.LINEA continuous section of railway track.LINE SIDEELECTRONIC UNITA device for communicating variable signalling data toswitchable balises.LINE SIDE EQUIPMENT see Trackside Equipment.LINKINGA functionality to protect against missing data from BALISEGROUPS by announcing them in advance through LINKINGINFORMATION and by checking whether they have been readwithin a certain EXPECTATION WINDOWLINKING DISTANCEThe distance between announced balise groups.LINKINGINFORMATIONData defining the distance between groups of balises, theiridentity and orientation, and the action to be taken if anannounced balise group is not detected within given limits(EXPECTATION WINDOW).LOCAL TIMEThe time for ordinary transactions in a locality, which is likely tobe shown on station clocks.LOOPTrack mounted device for the transmission of data between trackto-train within a defined area.LOOP MESSAGEFORMATThe format for transmitting data by a loop.LOOP TRANSMISSIONMODULEA module (inside the ERTMS/ETCS on-board equipment),which retrieves application data from a loop.MAIN SIGNALA fixed signal intended for train movements capable of showinga ‘danger aspect’ and one or more ‘proceed aspects’. In somecases main signals at danger are valid for shunt movements.MAINTAINABILITYThe probability that a given active maintenance action, for anitem under given conditions of use can be carried out within astated time interval when the maintenance is performed understated conditions and using stated procedures and resources.(3)(Definitions for other maintenance related terms are given inreference 3).MALFUNCTIONSUBSET-0233.3.0A deviation from the specified performance causing the systemto work incorrectly. This is normally due to an error or fault inthe system.Glossary of Terms and AbbreviationsPage 14/29

ERA * UNISIG * EEIG ERTMS USERS GROUPMANDATORYWhen it is compulsory to fulfil and to implement a requirementto realise a technically interoperable standard for theERTMS/ETCS equipment or system.MANUAL LEVELCHANGELevel transition initiated by the driver.MAYIs permissible.MAX SAFE FRONTENDThe maximum safe front end position differs from the estimatedposition by the Under-reading Amount in the distance measuredfrom the LRBG plus the Location Accuracy of the LRBGMIN SAFE FRONT ENDThe minimum safe front end position differs from the estimatedposition by the Over-reading Amount in the distance measuredfrom the LRBG plus the Location Accuracy of the LRBGMESSAGEThe combination of application data and protocol data that istransmitted by balise group, loop or radio to a train or from thetrain to trackside by radio.MESSAGEAUTHENTICATIONCODE (MAC)Code to provide data origin authentication and data integrity.MINOR FAILUREsee Failure, MinorMISSIONAn objective description of the fundamental task to beperformed by a system. (3)MISSION, ETCSAny train movement started under the supervision of anERTMS/ETCS on-board equipment in one the following modes:FS, LS, SR, OS, NL, UN, or SN.The ETCS mission is ended when any of the following modes isentered: SB, SHMODEAn operating state of the ERTMS/ETCS on-board equipment witha specified split of operational responsibilities between theERTMS/ETCS system and the driver.MOST RESTRICTIVESPEED PROFILEThe speed which a train must not exceed. It is the lowest speedtaking into account all the various speed profiles.MOVEMENTAUTHORITYPermission for a train to run to a specific location within theconstraints of the infrastructure.MOVING BLOCKA block whose length is defined by the position of the trainoccupying the section of track ahead.The minimum block length would be from the rear most part ofthe occupying train to a point on the track where, if the trainbraked from its current speed, the front of the occupying trainwould be when the train came to a stand.MULTIPLE UNITSSUBSET-0233.3.0Two or more traction units in service, mechanically, pneumaticallyand electrically coupled, which are operated by one driver.Glossary of Terms and AbbreviationsPage 15/29

ERA * UNISIG * EEIG ERTMS USERS GROUPNATIONAL SYSTEMMODEERTMS/ETCS on-board equipment mode in which thesupervision of the train is ensured by a National System.NATIONAL TRAINCONTROL SYSTEMA previously installed train control system defined as Class Bsystem in CCS TSI.NATIONAL VALUESValues that are transmitted to a train when entering theinfrastructure of an administration related to rules and regulationsof that administration. National values may be changed within anadministrations area.NO POWER MODEERTMS/ETCS on-board equipment mode in which the on-boardequipment is not powered and the emergency brake iscommanded.NON-EQUIPPED LINEA line without operational trackside Automatic Train Protectionsystem.NON-LEADING MODEERTMS/ETCS on-board equipment mode when it is connectedto an active cab which is not in the leading engine of the train.NON-VITALA description applied to those parts of the signalling systemwhose failure or non-availability does not directly endanger railtraffic or reduce the integrity of the signalling system.OCCUPIEDA track section having any part of a train present upon it.ODOMETERACCURACYThe extent to which the odometer might makeunderestimation/overestimation in measuring the movement ofthe train.ODOMETRYThe process of measuring the train’s movement along the track.Used for speed measurement and distance measurement.ODOMETRYREFERENCELOCATIONThe reference location to which refers the train based odometerdistance reading.OFF-LINE KMSKMS where distribution, deletion or updating of key entriesrequires staff intervention on the target device.ON-BOARDEQUIPMENTThe equipment carried on the train with the aim of supervisingvehicle operation.ON-BOARDRECORDING DEVICEA device (outside the ERTMS/ETCS on-board equipment) thatrecords and stores data for subsequent analysis (e.g. further toa train accident).ON-BOARD UNITSee ERTMS/ETCS ON-BOARD EQUIPMENT.ON-LINE KMSKMS allowing remote distribution, deletion or updating of keyentries in the target device.ON SIGHT MODEERTMS/ETCS on-board equipment mode that gives the driverpartial responsibility for the safe control of his train. In this modethe train possesses a movement authority but the track aheadmight be occupied by another train.SUBSET-0233.3.0Glossary of Terms and AbbreviationsPage 16/29

ERA * UNISIG * EEIG ERTMS USERS GROUPOPERATED SYSTEMVERSIONFor both trackside and on-board, to operate a system versionmeans to comply with the requirements from all TSI annex Adocuments, which are applicable to this system version and tothe concerned subsystem.The operated system version is ordered by trackside; however,to operate a system version number X within a delimitedtrackside area only means that an on-board equipment runningon this area shall behave according to the set of requirementsapplicable to the system version number X.Y where X is the oneordered by trackside and Y is the system version number Y(which may be different from the one ordered by trackside)operated by the on-board within this version X.OVERLAPThe section of line in advance of a stop signal that must beunoccupied and, where necessary, locked before and during asignalled running movement to the rear of the signal to avoid anaccident if the train brakes do not perform as well as expectedand the t

ERA * UNISIG * EEIG ERTMS USERS GROUP SUBSET-023 3.3.0 Glossary of Terms and Abbreviations Page 5/29 3. GENERAL 3.1. Scope of this document This document defines the s

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